# Message Structure

**Request and response message are both use following structure**

<table id="bkmrk-no.-parameter-format"><thead><tr><th style="width: 46px;">No.</th><th style="width: 93px;">Parameter</th><th style="width: 84px;">Format</th><th style="width: 143px;">Reference</th><th style="width: 144px;">Description</th><th style="width: 299px;">Memo</th></tr></thead><tbody><tr><td style="width: 46px;">1</td><td style="width: 93px;">action</td><td style="width: 84px;">String</td><td style="width: 143px;">inquiry</td><td style="width: 144px;">Transaction Type</td><td style="width: 299px;">The specific interfaces with detail description</td></tr><tr><td style="width: 46px;">2</td><td style="width: 93px;">deviceNo</td><td style="width: 84px;">String</td><td style="width: 143px;">POS01</td><td style="width: 144px;">Cashier Terminal No.</td><td style="width: 299px;">To identify the Cashier Terminal used in this transaction</td></tr><tr><td style="width: 46px;">3</td><td style="width: 93px;">shopNo</td><td style="width: 84px;">String</td><td style="width: 143px;">CN123456</td><td style="width: 144px;">Shop No.</td><td style="width: 299px;">To identify the merchant / shop in this transaction</td></tr><tr><td style="width: 46px;">4</td><td style="width: 93px;">brand</td><td style="width: 84px;">String</td><td style="width: 143px;">663</td><td style="width: 144px;">Brand No.</td><td style="width: 299px;">To identify the Brand used in this transaction, allocated by e-Buy</td></tr><tr><td style="width: 46px;">5</td><td style="width: 93px;">body</td><td style="width: 84px;">String</td><td style="width: 143px;">BASE64</td><td style="width: 144px;">Message Detail</td><td style="width: 299px;">The specific interfaces with detail description</td></tr><tr><td style="width: 46px;">6</td><td style="width: 93px;">mwVersion</td><td style="width: 84px;">String</td><td style="width: 143px;">20161010</td><td style="width: 144px;">[Middleware](https://book.e-buy.com/link/136#bkmrk-middleware "Individual operation in cashier terminal, monitoring the local port, it will also download the key and auto sign in, auto update and prompt transaction options") Version</td><td style="width: 299px;">The [Middleware](https://book.e-buy.com/link/136#bkmrk-middleware "Individual operation in cashier terminal, monitoring the local port, it will also download the key and auto sign in, auto update and prompt transaction options") is compatible to process with different backend system</td></tr><tr><td style="width: 46px;">7</td><td style="width: 93px;">ptlVersion</td><td style="width: 84px;">String</td><td style="width: 143px;">20161010</td><td style="width: 144px;">Protocal Version</td><td style="width: 299px;">The protocol is compatible to process with different backend system</td></tr><tr><td style="width: 46px;">8</td><td style="width: 93px;">posVersion</td><td style="width: 84px;">String</td><td style="width: 143px;">20161010</td><td style="width: 144px;">[e-Buy POS](https://book.e-buy.com/link/136#bkmrk-e-buy-pos "Same as MIS-POS, the device is installed in merchant on-site, providing the operation activity to support and exchange function") Version</td><td style="width: 299px;">The [e-Buy POS](https://book.e-buy.com/link/136#bkmrk-e-buy-pos "Same as MIS-POS, the device is installed in merchant on-site, providing the operation activity to support and exchange function") is compatible to process with different backend system</td></tr><tr><td style="width: 46px;">9</td><td style="width: 93px;">timestamp</td><td style="width: 84px;">String</td><td style="width: 143px;">1483372334</td><td style="width: 144px;">Unix Format</td><td style="width: 299px;">Unit : second，中间件需要在收到返回时同步该时间</td></tr><tr><td style="width: 46px;">10</td><td style="width: 93px;">sign</td><td style="width: 84px;">String</td><td style="width: 143px;">7E65B60DCFA42B04</td><td style="width: 144px;">Signature</td><td style="width: 299px;">See detail : Signature Algorithm</td></tr></tbody></table>

**example**

```
 {
     "action" : "inquiry",
     "deviceNo" : "POS01",
     "shopNo" : "CN123456",
     "brand" : "663",
     "body" : "ewogICAgICAgICAidHJhY2VObyI6ICI5OTAwMDAwOTEwMDAxMDEwMTczMjEyMyIsCiAgICAgICAgICJvcmlnaW5hbFRyYWNlTm8iOiAiOTkwMDAwMDkxMDAwMTAxMDE3MzIxMjQiCiAgICAgfQ==",
     "mwVersion" : "20161010",
     "ptlVersion" : "20161010",
     "posVersion" : "20161010",
     "timestamp" : "1483372334",
     "sign" : "7E65B60DCFA42B04"
 }
```